Dear Alice
Is everything going well these days? Thank you for trusting me and I'll share my opinion with you.
Your situation is very common among our teenagers. So please don't worry. First, your parents show overprotective to you because they love you, so you shouldn't be annoyed. Then, I believe that you are old enough and responsible enough, But your parents don't think so. As a result, you should have a talk with them and give them time to understand you. Above all, you and your friends do not have enough experience while going somewhere, so it's necessary for you to have your parents' supervision. Thus, I hold the belief that you should obey your parents' request and stay with them during this summer. It is the best choice. Looking forward to your early reply.
Best wishes
Li Hua